How to determine Steel Grade? [BS 5950]

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Discussion Overview

The discussion revolves around determining the steel grade for a specific beam section (e.g., UB 305x102x25) within the context of steel structures, referencing BS 5950. Participants also touch upon calculating the self-weight of the steel beam.

Discussion Character

  • Technical explanation, Conceptual clarification, Homework-related

Main Points Raised

  • One participant inquires about how to determine the steel grade from a given beam section, suggesting a lack of clarity on the relationship between section shape and material grade.
  • Another participant states that the beam section is only a shape and emphasizes that the steel grade is separate and not determined by the section itself.
  • A follow-up question is posed regarding the calculation of the self-weight of the steel beam, specifically asking if it involves multiplying the steel density by the area of the section.
  • A later reply suggests modeling the beam's self-weight as a distributed load based on the beam's volume and density.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between beam section and steel grade, with at least one participant clarifying that they are separate. The discussion on calculating self-weight appears to have a more unified approach, but no consensus is reached on the initial question regarding steel grade.

Contextual Notes

There may be limitations in understanding how steel grades are specified in relation to beam sections, as well as assumptions regarding the density and volume calculations for self-weight.

HarryKoh
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Hi guys, I'm still new to this steel structure, would like to ask if we know the section e.g UB 305x102x25, how do we determine the steel grade (S275, S355, etc)?

Thanks.
 
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The beam section is only the shape, the steel grade is separate and not controlled by the section.
 
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Mech_Engineer said:
The beam section is only the shape, the steel grade is separate and not controlled by the section.

Hi, thanks for the reply! I would also like to ask how do I count the selfweight of the steel? Take UB 305x102x25 as example.. so the steel density multiply the area of section? Thanks!
 
You model the beam's self-weight as a distributed load based on the beam volume and density.
 

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